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In this article, a green and recoverable heterogeneous phase-transfer catalyst containing silica-coated magnetite nanoparticles functionalized by polyethylene glycol and ethylenediamine was synthesized. After full characterization, the catalytic activity of the bifunctional magnetic nanocomposite was investigated in the straightforward synthesis of 2-amino-3-cyano-4H-pyrans under mild and green conditions through the one-pot reaction of aryl aldehydes with malononitrile and dimedone or 1,3-cyclohexanedione. Significant features such as mild reaction conditions, simple work-up, short reaction time, high product yield, and reusability of the catalyst, enhance the efficiency of this catalytic procedure economically and environmentally benefits.

Preparation and Characterization of Bifunctional PEG/en Nanomagnetic Phase-Transfer Catalyst: Green Synthesis of 2-Amino-3-Cyano-4H-Pyrans